Nice M-BAR Serie Instrucciones Y Advertencias Para La Instalación Y El Uso página 88

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Precautions for making the loops:
– install the loop close to the boom gate
– the inductive loop's electric cables must be routed
separately from the other cables in the boom gate
circuit (power, accessories, etc.)
– if the inductive loops are connected to different boom
gates, they must be located at least 1 m apart from
each other
– the inductive loop must be installed in such a way as
to be unable to move, since any movement due to an
unstable surface can cause false positives (undesired
tripping)
– the size of the loops must be deined based on the
application, bearing in mind that they must be located
at least 20 cm away from any ixed metal objects and 1
m away from any moving metal objects ("Figure 53").
To achieve the best result, we recommend using a loop
size no greater than that of the object to be detected
by the system
– loops used to detect the passage of cars or trucks are
generally rectangular, and they must be located at 45°
with respect to the bicycle/motorcycle lane ("Figure
54"). We recommend cutting the corners of the loor
trace at 45° to avoid breaking the cable
– to prevent interference, the loop cables must be
crossed at least 20 times per metre, and they should
not have joints; if you need to extend a cable, solder the
wires and seal them with heat-shrink sheathing
– the twisted cable should be no longer than 20 m.
53
Direction of travel
SM
Trafic lane
CR
88 – ENGLISH
~ 0,35 m
1 m
SM
CR
54
Direction of travel
SM
Trafic lane
CR
Instructions for making the loops
Once you have deined the size of the loop:
cut a trench in the loor; the trench should be 8 mm wide
1.
and 30-50 mm deep ("Figure 55")
clean the trench and insert the coil, pushing it thoroughly
2.
down so that it cannot move
complete the number of turns of the loop required by
3.
the perimeter as shown in "Table 20", using an isolated
single-pole copper wire with a cross-section of 1.5 mm
("Figure 55")
cover the loop with sand to protect it and then seal the
4.
trench with tar or outdoors looring resin ("Figure 55")
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Warning! – The sealant temperature may not
exceed the maximum temperature allowed for the
cable sheathing, otherwise the cable might not be
grounded correctly.
irst, connect the cables to the metal detector, and then
5.
connect them from the metal detector to the Loop1 and
Loop2 terminals.
POSITIONING THE LOOP
Perimeter of the loop
2 – 4 m
4 – 7 m
7 – 12 m
Greater than 12 m
If there is any metal reinforcing bar under the loor, loop
Note
induction is reduced. If so, run the loop twice more
around the perimeter.
~ 0,8 m
0,2 m
45°
SM
CR
Number of turns
6
5
4
3
2
Table 20